Authorities are still unsure of what led up to the shooting, which happened in an eastbound lane around 6:10 p.m. It may have been spurred by a blown checkpoint or refusal to stop by two men inside a Jeep.

As the suspects approached the toll plaza, police tried to stop the men. At that point, police said a “scuffle” ensued in which shots were initially fired by cops. Authorities then chased the suspects into the tunnel.

After the initial shooting, one of the men in the car got out and ran into another driver’s car in a desperate bid to escape.